SAPUI5: How to directly bind two data properties into one control property using OData model?

see the ansers in the link:

http://www.linkedin.com/groupAnswers?viewQuestionAndAnswers=&discussionID=5849070112413347841&gid=4568273&commentID=5849107259505811456&trk=view_disc&fromEmail=&ut=0I2h6UG4XXGC81